the advantages of DOL starter:-This is a protection device.
When motor takes large current from supply, then trip to
suplly.& safe from burn out.
When single phasing occures in the system then become
trip to sypply.by O.L.c.(over load coil).
main advantages of dol starter are
1.cost is less(star delta starter contains 3 contactors,a timer dol
contains a contactor only).
2.protection(it contains over current protection devices.star delta
starter also contains this)
3.less space is required
but it is used only for small motors like power less than 7.5,10Hp
what is the exact direction of current?
as we know current travels from higher potential to lower
potential,so if we take battery +ve to -ve implies current
direction is from positive terminal to negative
terminal.,whereas electrons flow from negative to positive
as they are attracted by positive ions.current will be the
plow of charge but not flow of positive ions.please clarify
my doubt friends.